Rigify error "NoneType" "Bones" when trying to Generate Rig
The problem is that for one reason or another the &quot;Rig Type&quot; is missing from your spine. Sometimes that happens due to a bug in Blender itself.
The fix is easy. In your MetaRig select the bone I have highlighted in the image. Make sure you're in Pose Mode! Go to Bone tab and under Rigify Type choose spines.basic_spine
Make sure your generated rig is visible and press Generate Rig. That should fix the non type error.

If you're interested, the error itself comes from the head/neck, because it has the &quot;connect chain&quot; option ON. This requires it to be snapped to another chain of bones. But since the Rig Type was missing, Rigify just ignores the Spine bone chain. And that produces the error.